Notes: Strom Mobile is a portable power solution for music makers and everyone who needs reliable voltage source at all times! The Strom Mobile transforms the output voltage of USB power banks (5V DC) to either 9V or 12V DC to power any (music) device running on those voltages. There are two independent channels which can output individually set voltages. The Strom Mobile includes an input current feedback system to save the user from exceeding the maximum output current of the USB powerbank in use.